A Republican senator said on Sunday that the lack of details about ObamaCare enrollment numbers suggests the Obama administration has “cooked the books.”

Sen. John Barrasso, R-Wyoming, made his comments just hours before the Monday deadline to enroll in the Affordable Care Act and was skeptical of the administration’s most recent enrollment figure of more than 6 million Americans.

Though the enrollment number now appears just a million shy of the administration’s goal of 7 million by the March 31 deadline, Barrasso said Americans who have switched to ObamaCare from insurance deemed sub-standard under the Affordable Care Act still don’t know whether they can keep their same doctors. And they don’t know whether their premiums will indeed be more affordable.

Among the other questions are whether enough younger people have enrolled in ObamaCare to cover the health care costs of older Americans in the program and how many of those enrolled previously were uninsured.

Maine Sen. Angus King, Independent, said on the show that the enrollment number is now at 6.5 million and that “signups are getting younger every day.”

However, he acknowledged the administration needs to be more forthcoming about the numbers, as Americans rely on third-party analysis to get much of their information.

“I do think there’s a transparency problem,” said King, adding he would be willing to work on legislation to fix such problems.

Said Barrasso: “I’ve looked at this 10 different ways. This health care law is unfixable.”